Consider two identical tanks of gas, one containing nitrogen, N2, and the other helium, He. Sally
performs an experiment that allows her to determine that the total internal energy of the
nitrogen is twice that of the helium. The molecular mass of N2 is 28 and the molecular mass of
He is 4. Both tanks of gas are at the same temperature, 293 K. What is the ratio of the number of
nitrogen molecules to the number of the helium molecules?
